The phenomenon and characters in climbing and suddenly changing of vibration on bearing no.9 of unit no.5 after overhaul in the process of start-up at Huangdao Power Plant have been presented

especially the rapid changing of vibration

boasting certain typical and representative characters.The causes leading to climbing and suddenly changing of vibration have been analysed

and disposal measures

such as controlling the tightness of coupling bolts between generator and slip-ring within 1700～2000 kNm

and controlling the swaying at bearing neck no.9 within 0.05 mm

being put forward.After implementation

the shaft vibration under constant speed 3000 r/min

and in the process of carrying load

is less than 90 μm

achieving the excellent level.